diff options
Diffstat (limited to 'mesalib/src/mesa/main/blend.c')
| -rw-r--r-- | mesalib/src/mesa/main/blend.c | 1636 |
1 files changed, 822 insertions, 814 deletions
diff --git a/mesalib/src/mesa/main/blend.c b/mesalib/src/mesa/main/blend.c index 30466cca3..c74a16803 100644 --- a/mesalib/src/mesa/main/blend.c +++ b/mesalib/src/mesa/main/blend.c @@ -1,814 +1,822 @@ -/**
- * \file blend.c
- * Blending operations.
- */
-
-/*
- * Mesa 3-D graphics library
- * Version: 6.5.1
- *
- * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-
-#include "glheader.h"
-#include "blend.h"
-#include "context.h"
-#include "enums.h"
-#include "macros.h"
-#include "mtypes.h"
-
-
-
-/**
- * Check if given blend source factor is legal.
- * \return GL_TRUE if legal, GL_FALSE otherwise.
- */
-static GLboolean
-legal_src_factor(const struct gl_context *ctx, GLenum factor)
-{
- switch (factor) {
- case GL_SRC_COLOR:
- case GL_ONE_MINUS_SRC_COLOR:
- return ctx->Extensions.NV_blend_square;
- case GL_ZERO:
- case GL_ONE:
- case GL_DST_COLOR:
- case GL_ONE_MINUS_DST_COLOR:
- case GL_SRC_ALPHA:
- case GL_ONE_MINUS_SRC_ALPHA:
- case GL_DST_ALPHA:
- case GL_ONE_MINUS_DST_ALPHA:
- case GL_SRC_ALPHA_SATURATE:
- case GL_CONSTANT_COLOR:
- case GL_ONE_MINUS_CONSTANT_COLOR:
- case GL_CONSTANT_ALPHA:
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- return GL_TRUE;
- default:
- return GL_FALSE;
- }
-}
-
-
-/**
- * Check if given blend destination factor is legal.
- * \return GL_TRUE if legal, GL_FALSE otherwise.
- */
-static GLboolean
-legal_dst_factor(const struct gl_context *ctx, GLenum factor)
-{
- switch (factor) {
- case GL_DST_COLOR:
- case GL_ONE_MINUS_DST_COLOR:
- return ctx->Extensions.NV_blend_square;
- case GL_ZERO:
- case GL_ONE:
- case GL_SRC_COLOR:
- case GL_ONE_MINUS_SRC_COLOR:
- case GL_SRC_ALPHA:
- case GL_ONE_MINUS_SRC_ALPHA:
- case GL_DST_ALPHA:
- case GL_ONE_MINUS_DST_ALPHA:
- case GL_CONSTANT_COLOR:
- case GL_ONE_MINUS_CONSTANT_COLOR:
- case GL_CONSTANT_ALPHA:
- case GL_ONE_MINUS_CONSTANT_ALPHA:
- return GL_TRUE;
- default:
- return GL_FALSE;
- }
-}
-
-
-/**
- * Check if src/dest RGB/A blend factors are legal. If not generate
- * a GL error.
- * \return GL_TRUE if factors are legal, GL_FALSE otherwise.
- */
-static GLboolean
-validate_blend_factors(struct gl_context *ctx, const char *func,
- GLenum sfactorRGB, GLenum dfactorRGB,
- GLenum sfactorA, GLenum dfactorA)
-{
- if (!legal_src_factor(ctx, sfactorRGB)) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "%s(sfactorRGB = %s)", func,
- _mesa_lookup_enum_by_nr(sfactorRGB));
- return GL_FALSE;
- }
-
- if (!legal_dst_factor(ctx, dfactorRGB)) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "%s(dfactorRGB = %s)", func,
- _mesa_lookup_enum_by_nr(dfactorRGB));
- return GL_FALSE;
- }
-
- if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "%s(sfactorA = %s)", func,
- _mesa_lookup_enum_by_nr(sfactorA));
- return GL_FALSE;
- }
-
- if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "%s(dfactorA = %s)", func,
- _mesa_lookup_enum_by_nr(dfactorA));
- return GL_FALSE;
- }
-
- return GL_TRUE;
-}
-
-
-/**
- * Specify the blending operation.
- *
- * \param sfactor source factor operator.
- * \param dfactor destination factor operator.
- *
- * \sa glBlendFunc, glBlendFuncSeparateEXT
- */
-void GLAPIENTRY
-_mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
-{
- _mesa_BlendFuncSeparateEXT(sfactor, dfactor, sfactor, dfactor);
-}
-
-
-/**
- * Set the separate blend source/dest factors for all draw buffers.
- *
- * \param sfactorRGB RGB source factor operator.
- * \param dfactorRGB RGB destination factor operator.
- * \param sfactorA alpha source factor operator.
- * \param dfactorA alpha destination factor operator.
- */
-void GLAPIENTRY
-_mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
- GLenum sfactorA, GLenum dfactorA )
-{
- GLuint buf, numBuffers;
- GLboolean changed;
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glBlendFuncSeparate %s %s %s %s\n",
- _mesa_lookup_enum_by_nr(sfactorRGB),
- _mesa_lookup_enum_by_nr(dfactorRGB),
- _mesa_lookup_enum_by_nr(sfactorA),
- _mesa_lookup_enum_by_nr(dfactorA));
-
- if (!validate_blend_factors(ctx, "glBlendFuncSeparate",
- sfactorRGB, dfactorRGB,
- sfactorA, dfactorA)) {
- return;
- }
-
- numBuffers = ctx->Extensions.ARB_draw_buffers_blend
- ? ctx->Const.MaxDrawBuffers : 1;
-
- changed = GL_FALSE;
- for (buf = 0; buf < numBuffers; buf++) {
- if (ctx->Color.Blend[buf].SrcRGB != sfactorRGB ||
- ctx->Color.Blend[buf].DstRGB != dfactorRGB ||
- ctx->Color.Blend[buf].SrcA != sfactorA ||
- ctx->Color.Blend[buf].DstA != dfactorA) {
- changed = GL_TRUE;
- break;
- }
- }
- if (!changed)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
-
- for (buf = 0; buf < numBuffers; buf++) {
- ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
- ctx->Color.Blend[buf].DstRGB = dfactorRGB;
- ctx->Color.Blend[buf].SrcA = sfactorA;
- ctx->Color.Blend[buf].DstA = dfactorA;
- }
- ctx->Color._BlendFuncPerBuffer = GL_FALSE;
-
- if (ctx->Driver.BlendFuncSeparate) {
- ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
- sfactorA, dfactorA);
- }
-}
-
-
-#if _HAVE_FULL_GL
-
-
-/**
- * Set blend source/dest factors for one color buffer/target.
- */
-void GLAPIENTRY
-_mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor)
-{
- _mesa_BlendFuncSeparatei(buf, sfactor, dfactor, sfactor, dfactor);
-}
-
-
-/**
- * Set separate blend source/dest factors for one color buffer/target.
- */
-void GLAPIENTRY
-_mesa_BlendFuncSeparatei(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
- GLenum sfactorA, GLenum dfactorA)
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (!ctx->Extensions.ARB_draw_buffers_blend) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendFunc[Separate]i()");
- return;
- }
-
- if (buf >= ctx->Const.MaxDrawBuffers) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
- buf);
- return;
- }
-
- if (!validate_blend_factors(ctx, "glBlendFuncSeparatei",
- sfactorRGB, dfactorRGB,
- sfactorA, dfactorA)) {
- return;
- }
-
- if (ctx->Color.Blend[buf].SrcRGB == sfactorRGB &&
- ctx->Color.Blend[buf].DstRGB == dfactorRGB &&
- ctx->Color.Blend[buf].SrcA == sfactorA &&
- ctx->Color.Blend[buf].DstA == dfactorA)
- return; /* no change */
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
-
- ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
- ctx->Color.Blend[buf].DstRGB = dfactorRGB;
- ctx->Color.Blend[buf].SrcA = sfactorA;
- ctx->Color.Blend[buf].DstA = dfactorA;
- ctx->Color._BlendFuncPerBuffer = GL_TRUE;
-
- if (ctx->Driver.BlendFuncSeparatei) {
- ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB,
- sfactorA, dfactorA);
- }
-}
-
-
-/**
- * Check if given blend equation is legal.
- * \return GL_TRUE if legal, GL_FALSE otherwise.
- */
-static GLboolean
-legal_blend_equation(const struct gl_context *ctx,
- GLenum mode, GLboolean is_separate)
-{
- switch (mode) {
- case GL_FUNC_ADD:
- return GL_TRUE;
- case GL_MIN:
- case GL_MAX:
- return ctx->Extensions.EXT_blend_minmax;
- case GL_LOGIC_OP:
- /* glBlendEquationSeparate cannot take GL_LOGIC_OP as a parameter.
- */
- return ctx->Extensions.EXT_blend_logic_op && !is_separate;
- case GL_FUNC_SUBTRACT:
- case GL_FUNC_REVERSE_SUBTRACT:
- return ctx->Extensions.EXT_blend_subtract;
- default:
- return GL_FALSE;
- }
-}
-
-
-/* This is really an extension function! */
-void GLAPIENTRY
-_mesa_BlendEquation( GLenum mode )
-{
- GLuint buf, numBuffers;
- GLboolean changed;
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glBlendEquation %s\n",
- _mesa_lookup_enum_by_nr(mode));
-
- if (!legal_blend_equation(ctx, mode, GL_FALSE)) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
- return;
- }
-
- numBuffers = ctx->Extensions.ARB_draw_buffers_blend
- ? ctx->Const.MaxDrawBuffers : 1;
-
- changed = GL_FALSE;
- for (buf = 0; buf < numBuffers; buf++) {
- if (ctx->Color.Blend[buf].EquationRGB != mode ||
- ctx->Color.Blend[buf].EquationA != mode) {
- changed = GL_TRUE;
- break;
- }
- }
- if (!changed)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- for (buf = 0; buf < numBuffers; buf++) {
- ctx->Color.Blend[buf].EquationRGB = mode;
- ctx->Color.Blend[buf].EquationA = mode;
- }
- ctx->Color._BlendEquationPerBuffer = GL_FALSE;
-
- if (ctx->Driver.BlendEquationSeparate)
- (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
-}
-
-
-/**
- * Set blend equation for one color buffer/target.
- */
-void GLAPIENTRY
-_mesa_BlendEquationi(GLuint buf, GLenum mode)
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n",
- buf, _mesa_lookup_enum_by_nr(mode));
-
- if (buf >= ctx->Const.MaxDrawBuffers) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
- buf);
- return;
- }
-
- if (!legal_blend_equation(ctx, mode, GL_FALSE)) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi");
- return;
- }
-
- if (ctx->Color.Blend[buf].EquationRGB == mode &&
- ctx->Color.Blend[buf].EquationA == mode)
- return; /* no change */
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.Blend[buf].EquationRGB = mode;
- ctx->Color.Blend[buf].EquationA = mode;
- ctx->Color._BlendEquationPerBuffer = GL_TRUE;
-
- if (ctx->Driver.BlendEquationSeparatei)
- ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
-}
-
-
-void GLAPIENTRY
-_mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA )
-{
- GLuint buf, numBuffers;
- GLboolean changed;
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glBlendEquationSeparateEXT %s %s\n",
- _mesa_lookup_enum_by_nr(modeRGB),
- _mesa_lookup_enum_by_nr(modeA));
-
- if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) {
- _mesa_error(ctx, GL_INVALID_OPERATION,
- "glBlendEquationSeparateEXT not supported by driver");
- return;
- }
-
- if (!legal_blend_equation(ctx, modeRGB, GL_TRUE)) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
- return;
- }
-
- if (!legal_blend_equation(ctx, modeA, GL_TRUE)) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)");
- return;
- }
-
- numBuffers = ctx->Extensions.ARB_draw_buffers_blend
- ? ctx->Const.MaxDrawBuffers : 1;
-
- changed = GL_FALSE;
- for (buf = 0; buf < numBuffers; buf++) {
- if (ctx->Color.Blend[buf].EquationRGB != modeRGB ||
- ctx->Color.Blend[buf].EquationA != modeA) {
- changed = GL_TRUE;
- break;
- }
- }
- if (!changed)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- for (buf = 0; buf < numBuffers; buf++) {
- ctx->Color.Blend[buf].EquationRGB = modeRGB;
- ctx->Color.Blend[buf].EquationA = modeA;
- }
- ctx->Color._BlendEquationPerBuffer = GL_FALSE;
-
- if (ctx->Driver.BlendEquationSeparate)
- ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA);
-}
-
-
-/**
- * Set separate blend equations for one color buffer/target.
- */
-void
-_mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA)
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glBlendEquationSeparatei %u, %s %s\n", buf,
- _mesa_lookup_enum_by_nr(modeRGB),
- _mesa_lookup_enum_by_nr(modeA));
-
- if (buf >= ctx->Const.MaxDrawBuffers) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)",
- buf);
- return;
- }
-
- if (!legal_blend_equation(ctx, modeRGB, GL_TRUE)) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
- return;
- }
-
- if (!legal_blend_equation(ctx, modeA, GL_TRUE)) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)");
- return;
- }
-
- if (ctx->Color.Blend[buf].EquationRGB == modeRGB &&
- ctx->Color.Blend[buf].EquationA == modeA)
- return; /* no change */
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.Blend[buf].EquationRGB = modeRGB;
- ctx->Color.Blend[buf].EquationA = modeA;
- ctx->Color._BlendEquationPerBuffer = GL_TRUE;
-
- if (ctx->Driver.BlendEquationSeparatei)
- ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA);
-}
-
-
-
-#endif /* _HAVE_FULL_GL */
-
-
-/**
- * Set the blending color.
- *
- * \param red red color component.
- * \param green green color component.
- * \param blue blue color component.
- * \param alpha alpha color component.
- *
- * \sa glBlendColor().
- *
- * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a
- * change, flushes the vertices and notifies the driver via
- * dd_function_table::BlendColor callback.
- */
-void GLAPIENTRY
-_mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
-{
- GLfloat tmp[4];
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- tmp[0] = CLAMP( red, 0.0F, 1.0F );
- tmp[1] = CLAMP( green, 0.0F, 1.0F );
- tmp[2] = CLAMP( blue, 0.0F, 1.0F );
- tmp[3] = CLAMP( alpha, 0.0F, 1.0F );
-
- if (TEST_EQ_4V(tmp, ctx->Color.BlendColor))
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- COPY_4FV( ctx->Color.BlendColor, tmp );
-
- if (ctx->Driver.BlendColor)
- (*ctx->Driver.BlendColor)(ctx, tmp);
-}
-
-
-/**
- * Specify the alpha test function.
- *
- * \param func alpha comparison function.
- * \param ref reference value.
- *
- * Verifies the parameters and updates gl_colorbuffer_attrib.
- * On a change, flushes the vertices and notifies the driver via
- * dd_function_table::AlphaFunc callback.
- */
-void GLAPIENTRY
-_mesa_AlphaFunc( GLenum func, GLclampf ref )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- switch (func) {
- case GL_NEVER:
- case GL_LESS:
- case GL_EQUAL:
- case GL_LEQUAL:
- case GL_GREATER:
- case GL_NOTEQUAL:
- case GL_GEQUAL:
- case GL_ALWAYS:
- ref = CLAMP(ref, 0.0F, 1.0F);
-
- if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRef == ref)
- return; /* no change */
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.AlphaFunc = func;
- ctx->Color.AlphaRef = ref;
-
- if (ctx->Driver.AlphaFunc)
- ctx->Driver.AlphaFunc(ctx, func, ref);
- return;
-
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" );
- return;
- }
-}
-
-
-/**
- * Specify a logic pixel operation for color index rendering.
- *
- * \param opcode operation.
- *
- * Verifies that \p opcode is a valid enum and updates
-gl_colorbuffer_attrib::LogicOp.
- * On a change, flushes the vertices and notifies the driver via the
- * dd_function_table::LogicOpcode callback.
- */
-void GLAPIENTRY
-_mesa_LogicOp( GLenum opcode )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- switch (opcode) {
- case GL_CLEAR:
- case GL_SET:
- case GL_COPY:
- case GL_COPY_INVERTED:
- case GL_NOOP:
- case GL_INVERT:
- case GL_AND:
- case GL_NAND:
- case GL_OR:
- case GL_NOR:
- case GL_XOR:
- case GL_EQUIV:
- case GL_AND_REVERSE:
- case GL_AND_INVERTED:
- case GL_OR_REVERSE:
- case GL_OR_INVERTED:
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
- return;
- }
-
- if (ctx->Color.LogicOp == opcode)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.LogicOp = opcode;
-
- if (ctx->Driver.LogicOpcode)
- ctx->Driver.LogicOpcode( ctx, opcode );
-}
-
-#if _HAVE_FULL_GL
-void GLAPIENTRY
-_mesa_IndexMask( GLuint mask )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (ctx->Color.IndexMask == mask)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- ctx->Color.IndexMask = mask;
-}
-#endif
-
-
-/**
- * Enable or disable writing of frame buffer color components.
- *
- * \param red whether to mask writing of the red color component.
- * \param green whether to mask writing of the green color component.
- * \param blue whether to mask writing of the blue color component.
- * \param alpha whether to mask writing of the alpha color component.
- *
- * \sa glColorMask().
- *
- * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
- * change, flushes the vertices and notifies the driver via the
- * dd_function_table::ColorMask callback.
- */
-void GLAPIENTRY
-_mesa_ColorMask( GLboolean red, GLboolean green,
- GLboolean blue, GLboolean alpha )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLubyte tmp[4];
- GLuint i;
- GLboolean flushed;
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glColorMask %d %d %d %d\n", red, green, blue, alpha);
-
- /* Shouldn't have any information about channel depth in core mesa
- * -- should probably store these as the native booleans:
- */
- tmp[RCOMP] = red ? 0xff : 0x0;
- tmp[GCOMP] = green ? 0xff : 0x0;
- tmp[BCOMP] = blue ? 0xff : 0x0;
- tmp[ACOMP] = alpha ? 0xff : 0x0;
-
- flushed = GL_FALSE;
- for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
- if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) {
- if (!flushed) {
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- }
- flushed = GL_TRUE;
- COPY_4UBV(ctx->Color.ColorMask[i], tmp);
- }
- }
-
- if (ctx->Driver.ColorMask)
- ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
-}
-
-
-/**
- * For GL_EXT_draw_buffers2 and GL3
- */
-void GLAPIENTRY
-_mesa_ColorMaskIndexed( GLuint buf, GLboolean red, GLboolean green,
- GLboolean blue, GLboolean alpha )
-{
- GLubyte tmp[4];
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n",
- buf, red, green, blue, alpha);
-
- if (buf >= ctx->Const.MaxDrawBuffers) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf);
- return;
- }
-
- /* Shouldn't have any information about channel depth in core mesa
- * -- should probably store these as the native booleans:
- */
- tmp[RCOMP] = red ? 0xff : 0x0;
- tmp[GCOMP] = green ? 0xff : 0x0;
- tmp[BCOMP] = blue ? 0xff : 0x0;
- tmp[ACOMP] = alpha ? 0xff : 0x0;
-
- if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf]))
- return;
-
- FLUSH_VERTICES(ctx, _NEW_COLOR);
- COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
-
- if (ctx->Driver.ColorMaskIndexed)
- ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha);
-}
-
-
-extern void GLAPIENTRY
-_mesa_ClampColorARB(GLenum target, GLenum clamp)
-{
- GET_CURRENT_CONTEXT(ctx);
-
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)");
- return;
- }
-
- switch (target) {
- case GL_CLAMP_VERTEX_COLOR_ARB:
- ctx->Light.ClampVertexColor = clamp;
- break;
- case GL_CLAMP_FRAGMENT_COLOR_ARB:
- ctx->Color.ClampFragmentColor = clamp;
- break;
- case GL_CLAMP_READ_COLOR_ARB:
- ctx->Color.ClampReadColor = clamp;
- break;
- default:
- _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)");
- return;
- }
-}
-
-
-
-
-/**********************************************************************/
-/** \name Initialization */
-/*@{*/
-
-/**
- * Initialization of the context's Color attribute group.
- *
- * \param ctx GL context.
- *
- * Initializes the related fields in the context color attribute group,
- * __struct gl_contextRec::Color.
- */
-void _mesa_init_color( struct gl_context * ctx )
-{
- GLuint i;
-
- /* Color buffer group */
- ctx->Color.IndexMask = ~0u;
- memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
- ctx->Color.ClearIndex = 0;
- ASSIGN_4V( ctx->Color.ClearColor, 0, 0, 0, 0 );
- ctx->Color.AlphaEnabled = GL_FALSE;
- ctx->Color.AlphaFunc = GL_ALWAYS;
- ctx->Color.AlphaRef = 0;
- ctx->Color.BlendEnabled = 0x0;
- for (i = 0; i < Elements(ctx->Color.Blend); i++) {
- ctx->Color.Blend[i].SrcRGB = GL_ONE;
- ctx->Color.Blend[i].DstRGB = GL_ZERO;
- ctx->Color.Blend[i].SrcA = GL_ONE;
- ctx->Color.Blend[i].DstA = GL_ZERO;
- ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
- ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
- }
- ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
- ctx->Color.IndexLogicOpEnabled = GL_FALSE;
- ctx->Color.ColorLogicOpEnabled = GL_FALSE;
- ctx->Color._LogicOpEnabled = GL_FALSE;
- ctx->Color.LogicOp = GL_COPY;
- ctx->Color.DitherFlag = GL_TRUE;
-
- if (ctx->Visual.doubleBufferMode) {
- ctx->Color.DrawBuffer[0] = GL_BACK;
- }
- else {
- ctx->Color.DrawBuffer[0] = GL_FRONT;
- }
-
- ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB;
- ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;
-}
-
-/*@}*/
+/** + * \file blend.c + * Blending operations. + */ + +/* + * Mesa 3-D graphics library + * Version: 6.5.1 + * + * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + + +#include "glheader.h" +#include "blend.h" +#include "context.h" +#include "enums.h" +#include "macros.h" +#include "mtypes.h" + + + +/** + * Check if given blend source factor is legal. + * \return GL_TRUE if legal, GL_FALSE otherwise. + */ +static GLboolean +legal_src_factor(const struct gl_context *ctx, GLenum factor) +{ + switch (factor) { + case GL_SRC_COLOR: + case GL_ONE_MINUS_SRC_COLOR: + return ctx->Extensions.NV_blend_square; + case GL_ZERO: + case GL_ONE: + case GL_DST_COLOR: + case GL_ONE_MINUS_DST_COLOR: + case GL_SRC_ALPHA: + case GL_ONE_MINUS_SRC_ALPHA: + case GL_DST_ALPHA: + case GL_ONE_MINUS_DST_ALPHA: + case GL_SRC_ALPHA_SATURATE: + case GL_CONSTANT_COLOR: + case GL_ONE_MINUS_CONSTANT_COLOR: + case GL_CONSTANT_ALPHA: + case GL_ONE_MINUS_CONSTANT_ALPHA: + return GL_TRUE; + default: + return GL_FALSE; + } +} + + +/** + * Check if given blend destination factor is legal. + * \return GL_TRUE if legal, GL_FALSE otherwise. + */ +static GLboolean +legal_dst_factor(const struct gl_context *ctx, GLenum factor) +{ + switch (factor) { + case GL_DST_COLOR: + case GL_ONE_MINUS_DST_COLOR: + return ctx->Extensions.NV_blend_square; + case GL_ZERO: + case GL_ONE: + case GL_SRC_COLOR: + case GL_ONE_MINUS_SRC_COLOR: + case GL_SRC_ALPHA: + case GL_ONE_MINUS_SRC_ALPHA: + case GL_DST_ALPHA: + case GL_ONE_MINUS_DST_ALPHA: + case GL_CONSTANT_COLOR: + case GL_ONE_MINUS_CONSTANT_COLOR: + case GL_CONSTANT_ALPHA: + case GL_ONE_MINUS_CONSTANT_ALPHA: + return GL_TRUE; + default: + return GL_FALSE; + } +} + + +/** + * Check if src/dest RGB/A blend factors are legal. If not generate + * a GL error. + * \return GL_TRUE if factors are legal, GL_FALSE otherwise. + */ +static GLboolean +validate_blend_factors(struct gl_context *ctx, const char *func, + GLenum sfactorRGB, GLenum dfactorRGB, + GLenum sfactorA, GLenum dfactorA) +{ + if (!legal_src_factor(ctx, sfactorRGB)) { + _mesa_error(ctx, GL_INVALID_ENUM, + "%s(sfactorRGB = %s)", func, + _mesa_lookup_enum_by_nr(sfactorRGB)); + return GL_FALSE; + } + + if (!legal_dst_factor(ctx, dfactorRGB)) { + _mesa_error(ctx, GL_INVALID_ENUM, + "%s(dfactorRGB = %s)", func, + _mesa_lookup_enum_by_nr(dfactorRGB)); + return GL_FALSE; + } + + if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) { + _mesa_error(ctx, GL_INVALID_ENUM, + "%s(sfactorA = %s)", func, + _mesa_lookup_enum_by_nr(sfactorA)); + return GL_FALSE; + } + + if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) { + _mesa_error(ctx, GL_INVALID_ENUM, + "%s(dfactorA = %s)", func, + _mesa_lookup_enum_by_nr(dfactorA)); + return GL_FALSE; + } + + return GL_TRUE; +} + + +/** + * Specify the blending operation. + * + * \param sfactor source factor operator. + * \param dfactor destination factor operator. + * + * \sa glBlendFunc, glBlendFuncSeparateEXT + */ +void GLAPIENTRY +_mesa_BlendFunc( GLenum sfactor, GLenum dfactor ) +{ + _mesa_BlendFuncSeparateEXT(sfactor, dfactor, sfactor, dfactor); +} + + +/** + * Set the separate blend source/dest factors for all draw buffers. + * + * \param sfactorRGB RGB source factor operator. + * \param dfactorRGB RGB destination factor operator. + * \param sfactorA alpha source factor operator. + * \param dfactorA alpha destination factor operator. + */ +void GLAPIENTRY +_mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB, + GLenum sfactorA, GLenum dfactorA ) +{ + GLuint buf, numBuffers; + GLboolean changed; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glBlendFuncSeparate %s %s %s %s\n", + _mesa_lookup_enum_by_nr(sfactorRGB), + _mesa_lookup_enum_by_nr(dfactorRGB), + _mesa_lookup_enum_by_nr(sfactorA), + _mesa_lookup_enum_by_nr(dfactorA)); + + if (!validate_blend_factors(ctx, "glBlendFuncSeparate", + sfactorRGB, dfactorRGB, + sfactorA, dfactorA)) { + return; + } + + numBuffers = ctx->Extensions.ARB_draw_buffers_blend + ? ctx->Const.MaxDrawBuffers : 1; + + changed = GL_FALSE; + for (buf = 0; buf < numBuffers; buf++) { + if (ctx->Color.Blend[buf].SrcRGB != sfactorRGB || + ctx->Color.Blend[buf].DstRGB != dfactorRGB || + ctx->Color.Blend[buf].SrcA != sfactorA || + ctx->Color.Blend[buf].DstA != dfactorA) { + changed = GL_TRUE; + break; + } + } + if (!changed) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + + for (buf = 0; buf < numBuffers; buf++) { + ctx->Color.Blend[buf].SrcRGB = sfactorRGB; + ctx->Color.Blend[buf].DstRGB = dfactorRGB; + ctx->Color.Blend[buf].SrcA = sfactorA; + ctx->Color.Blend[buf].DstA = dfactorA; + } + ctx->Color._BlendFuncPerBuffer = GL_FALSE; + + if (ctx->Driver.BlendFuncSeparate) { + ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB, + sfactorA, dfactorA); + } +} + + +#if _HAVE_FULL_GL + + +/** + * Set blend source/dest factors for one color buffer/target. + */ +void GLAPIENTRY +_mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor) +{ + _mesa_BlendFuncSeparatei(buf, sfactor, dfactor, sfactor, dfactor); +} + + +/** + * Set separate blend source/dest factors for one color buffer/target. + */ +void GLAPIENTRY +_mesa_BlendFuncSeparatei(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB, + GLenum sfactorA, GLenum dfactorA) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (!ctx->Extensions.ARB_draw_buffers_blend) { + _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendFunc[Separate]i()"); + return; + } + + if (buf >= ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)", + buf); + return; + } + + if (!validate_blend_factors(ctx, "glBlendFuncSeparatei", + sfactorRGB, dfactorRGB, + sfactorA, dfactorA)) { + return; + } + + if (ctx->Color.Blend[buf].SrcRGB == sfactorRGB && + ctx->Color.Blend[buf].DstRGB == dfactorRGB && + ctx->Color.Blend[buf].SrcA == sfactorA && + ctx->Color.Blend[buf].DstA == dfactorA) + return; /* no change */ + + FLUSH_VERTICES(ctx, _NEW_COLOR); + + ctx->Color.Blend[buf].SrcRGB = sfactorRGB; + ctx->Color.Blend[buf].DstRGB = dfactorRGB; + ctx->Color.Blend[buf].SrcA = sfactorA; + ctx->Color.Blend[buf].DstA = dfactorA; + ctx->Color._BlendFuncPerBuffer = GL_TRUE; + + if (ctx->Driver.BlendFuncSeparatei) { + ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB, + sfactorA, dfactorA); + } +} + + +/** + * Check if given blend equation is legal. + * \return GL_TRUE if legal, GL_FALSE otherwise. + */ +static GLboolean +legal_blend_equation(const struct gl_context *ctx, + GLenum mode, GLboolean is_separate) +{ + switch (mode) { + case GL_FUNC_ADD: + return GL_TRUE; + case GL_MIN: + case GL_MAX: + return ctx->Extensions.EXT_blend_minmax; + case GL_LOGIC_OP: + /* glBlendEquationSeparate cannot take GL_LOGIC_OP as a parameter. + */ + return ctx->Extensions.EXT_blend_logic_op && !is_separate; + case GL_FUNC_SUBTRACT: + case GL_FUNC_REVERSE_SUBTRACT: + return ctx->Extensions.EXT_blend_subtract; + default: + return GL_FALSE; + } +} + + +/* This is really an extension function! */ +void GLAPIENTRY +_mesa_BlendEquation( GLenum mode ) +{ + GLuint buf, numBuffers; + GLboolean changed; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glBlendEquation(%s)\n", + _mesa_lookup_enum_by_nr(mode)); + + if (!legal_blend_equation(ctx, mode, GL_FALSE)) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation"); + return; + } + + numBuffers = ctx->Extensions.ARB_draw_buffers_blend + ? ctx->Const.MaxDrawBuffers : 1; + + changed = GL_FALSE; + for (buf = 0; buf < numBuffers; buf++) { + if (ctx->Color.Blend[buf].EquationRGB != mode || + ctx->Color.Blend[buf].EquationA != mode) { + changed = GL_TRUE; + break; + } + } + if (!changed) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + for (buf = 0; buf < numBuffers; buf++) { + ctx->Color.Blend[buf].EquationRGB = mode; + ctx->Color.Blend[buf].EquationA = mode; + } + ctx->Color._BlendEquationPerBuffer = GL_FALSE; + + if (ctx->Driver.BlendEquationSeparate) + (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode ); +} + + +/** + * Set blend equation for one color buffer/target. + */ +void GLAPIENTRY +_mesa_BlendEquationi(GLuint buf, GLenum mode) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n", + buf, _mesa_lookup_enum_by_nr(mode)); + + if (buf >= ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)", + buf); + return; + } + + if (!legal_blend_equation(ctx, mode, GL_FALSE)) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi"); + return; + } + + if (ctx->Color.Blend[buf].EquationRGB == mode && + ctx->Color.Blend[buf].EquationA == mode) + return; /* no change */ + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.Blend[buf].EquationRGB = mode; + ctx->Color.Blend[buf].EquationA = mode; + ctx->Color._BlendEquationPerBuffer = GL_TRUE; + + if (ctx->Driver.BlendEquationSeparatei) + ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode); +} + + +void GLAPIENTRY +_mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA ) +{ + GLuint buf, numBuffers; + GLboolean changed; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glBlendEquationSeparateEXT(%s %s)\n", + _mesa_lookup_enum_by_nr(modeRGB), + _mesa_lookup_enum_by_nr(modeA)); + + if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) { + _mesa_error(ctx, GL_INVALID_OPERATION, + "glBlendEquationSeparateEXT not supported by driver"); + return; + } + + if (!legal_blend_equation(ctx, modeRGB, GL_TRUE)) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)"); + return; + } + + if (!legal_blend_equation(ctx, modeA, GL_TRUE)) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)"); + return; + } + + numBuffers = ctx->Extensions.ARB_draw_buffers_blend + ? ctx->Const.MaxDrawBuffers : 1; + + changed = GL_FALSE; + for (buf = 0; buf < numBuffers; buf++) { + if (ctx->Color.Blend[buf].EquationRGB != modeRGB || + ctx->Color.Blend[buf].EquationA != modeA) { + changed = GL_TRUE; + break; + } + } + if (!changed) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + for (buf = 0; buf < numBuffers; buf++) { + ctx->Color.Blend[buf].EquationRGB = modeRGB; + ctx->Color.Blend[buf].EquationA = modeA; + } + ctx->Color._BlendEquationPerBuffer = GL_FALSE; + + if (ctx->Driver.BlendEquationSeparate) + ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA); +} + + +/** + * Set separate blend equations for one color buffer/target. + */ +void +_mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glBlendEquationSeparatei(%u, %s %s)\n", buf, + _mesa_lookup_enum_by_nr(modeRGB), + _mesa_lookup_enum_by_nr(modeA)); + + if (buf >= ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)", + buf); + return; + } + + if (!legal_blend_equation(ctx, modeRGB, GL_TRUE)) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)"); + return; + } + + if (!legal_blend_equation(ctx, modeA, GL_TRUE)) { + _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)"); + return; + } + + if (ctx->Color.Blend[buf].EquationRGB == modeRGB && + ctx->Color.Blend[buf].EquationA == modeA) + return; /* no change */ + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.Blend[buf].EquationRGB = modeRGB; + ctx->Color.Blend[buf].EquationA = modeA; + ctx->Color._BlendEquationPerBuffer = GL_TRUE; + + if (ctx->Driver.BlendEquationSeparatei) + ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA); +} + + + +#endif /* _HAVE_FULL_GL */ + + +/** + * Set the blending color. + * + * \param red red color component. + * \param green green color component. + * \param blue blue color component. + * \param alpha alpha color component. + * + * \sa glBlendColor(). + * + * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a + * change, flushes the vertices and notifies the driver via + * dd_function_table::BlendColor callback. + */ +void GLAPIENTRY +_mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha ) +{ + GLfloat tmp[4]; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + tmp[0] = CLAMP( red, 0.0F, 1.0F ); + tmp[1] = CLAMP( green, 0.0F, 1.0F ); + tmp[2] = CLAMP( blue, 0.0F, 1.0F ); + tmp[3] = CLAMP( alpha, 0.0F, 1.0F ); + + if (TEST_EQ_4V(tmp, ctx->Color.BlendColor)) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + COPY_4FV( ctx->Color.BlendColor, tmp ); + + if (ctx->Driver.BlendColor) + (*ctx->Driver.BlendColor)(ctx, tmp); +} + + +/** + * Specify the alpha test function. + * + * \param func alpha comparison function. + * \param ref reference value. + * + * Verifies the parameters and updates gl_colorbuffer_attrib. + * On a change, flushes the vertices and notifies the driver via + * dd_function_table::AlphaFunc callback. + */ +void GLAPIENTRY +_mesa_AlphaFunc( GLenum func, GLclampf ref ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glAlphaFunc(%s, %f)\n", + _mesa_lookup_enum_by_nr(func), ref); + + switch (func) { + case GL_NEVER: + case GL_LESS: + case GL_EQUAL: + case GL_LEQUAL: + case GL_GREATER: + case GL_NOTEQUAL: + case GL_GEQUAL: + case GL_ALWAYS: + ref = CLAMP(ref, 0.0F, 1.0F); + + if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRef == ref) + return; /* no change */ + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.AlphaFunc = func; + ctx->Color.AlphaRef = ref; + + if (ctx->Driver.AlphaFunc) + ctx->Driver.AlphaFunc(ctx, func, ref); + return; + + default: + _mesa_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" ); + return; + } +} + + +/** + * Specify a logic pixel operation for color index rendering. + * + * \param opcode operation. + * + * Verifies that \p opcode is a valid enum and updates +gl_colorbuffer_attrib::LogicOp. + * On a change, flushes the vertices and notifies the driver via the + * dd_function_table::LogicOpcode callback. + */ +void GLAPIENTRY +_mesa_LogicOp( GLenum opcode ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glLogicOp(%s)\n", _mesa_lookup_enum_by_nr(opcode)); + + switch (opcode) { + case GL_CLEAR: + case GL_SET: + case GL_COPY: + case GL_COPY_INVERTED: + case GL_NOOP: + case GL_INVERT: + case GL_AND: + case GL_NAND: + case GL_OR: + case GL_NOR: + case GL_XOR: + case GL_EQUIV: + case GL_AND_REVERSE: + case GL_AND_INVERTED: + case GL_OR_REVERSE: + case GL_OR_INVERTED: + break; + default: + _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" ); + return; + } + + if (ctx->Color.LogicOp == opcode) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.LogicOp = opcode; + + if (ctx->Driver.LogicOpcode) + ctx->Driver.LogicOpcode( ctx, opcode ); +} + +#if _HAVE_FULL_GL +void GLAPIENTRY +_mesa_IndexMask( GLuint mask ) +{ + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (ctx->Color.IndexMask == mask) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + ctx->Color.IndexMask = mask; +} +#endif + + +/** + * Enable or disable writing of frame buffer color components. + * + * \param red whether to mask writing of the red color component. + * \param green whether to mask writing of the green color component. + * \param blue whether to mask writing of the blue color component. + * \param alpha whether to mask writing of the alpha color component. + * + * \sa glColorMask(). + * + * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a + * change, flushes the vertices and notifies the driver via the + * dd_function_table::ColorMask callback. + */ +void GLAPIENTRY +_mesa_ColorMask( GLboolean red, GLboolean green, + GLboolean blue, GLboolean alpha ) +{ + GET_CURRENT_CONTEXT(ctx); + GLubyte tmp[4]; + GLuint i; + GLboolean flushed; + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glColorMask(%d, %d, %d, %d)\n", + red, green, blue, alpha); + + /* Shouldn't have any information about channel depth in core mesa + * -- should probably store these as the native booleans: + */ + tmp[RCOMP] = red ? 0xff : 0x0; + tmp[GCOMP] = green ? 0xff : 0x0; + tmp[BCOMP] = blue ? 0xff : 0x0; + tmp[ACOMP] = alpha ? 0xff : 0x0; + + flushed = GL_FALSE; + for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) { + if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) { + if (!flushed) { + FLUSH_VERTICES(ctx, _NEW_COLOR); + } + flushed = GL_TRUE; + COPY_4UBV(ctx->Color.ColorMask[i], tmp); + } + } + + if (ctx->Driver.ColorMask) + ctx->Driver.ColorMask( ctx, red, green, blue, alpha ); +} + + +/** + * For GL_EXT_draw_buffers2 and GL3 + */ +void GLAPIENTRY +_mesa_ColorMaskIndexed( GLuint buf, GLboolean red, GLboolean green, + GLboolean blue, GLboolean alpha ) +{ + GLubyte tmp[4]; + GET_CURRENT_CONTEXT(ctx); + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (MESA_VERBOSE & VERBOSE_API) + _mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n", + buf, red, green, blue, alpha); + + if (buf >= ctx->Const.MaxDrawBuffers) { + _mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf); + return; + } + + /* Shouldn't have any information about channel depth in core mesa + * -- should probably store these as the native booleans: + */ + tmp[RCOMP] = red ? 0xff : 0x0; + tmp[GCOMP] = green ? 0xff : 0x0; + tmp[BCOMP] = blue ? 0xff : 0x0; + tmp[ACOMP] = alpha ? 0xff : 0x0; + + if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf])) + return; + + FLUSH_VERTICES(ctx, _NEW_COLOR); + COPY_4UBV(ctx->Color.ColorMask[buf], tmp); + + if (ctx->Driver.ColorMaskIndexed) + ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha); +} + + +extern void GLAPIENTRY +_mesa_ClampColorARB(GLenum target, GLenum clamp) +{ + GET_CURRENT_CONTEXT(ctx); + + ASSERT_OUTSIDE_BEGIN_END(ctx); + + if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) { + _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)"); + return; + } + + switch (target) { + case GL_CLAMP_VERTEX_COLOR_ARB: + ctx->Light.ClampVertexColor = clamp; + break; + case GL_CLAMP_FRAGMENT_COLOR_ARB: + ctx->Color.ClampFragmentColor = clamp; + break; + case GL_CLAMP_READ_COLOR_ARB: + ctx->Color.ClampReadColor = clamp; + break; + default: + _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)"); + return; + } +} + + + + +/**********************************************************************/ +/** \name Initialization */ +/*@{*/ + +/** + * Initialization of the context's Color attribute group. + * + * \param ctx GL context. + * + * Initializes the related fields in the context color attribute group, + * __struct gl_contextRec::Color. + */ +void _mesa_init_color( struct gl_context * ctx ) +{ + GLuint i; + + /* Color buffer group */ + ctx->Color.IndexMask = ~0u; + memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask)); + ctx->Color.ClearIndex = 0; + ASSIGN_4V( ctx->Color.ClearColor, 0, 0, 0, 0 ); + ctx->Color.AlphaEnabled = GL_FALSE; + ctx->Color.AlphaFunc = GL_ALWAYS; + ctx->Color.AlphaRef = 0; + ctx->Color.BlendEnabled = 0x0; + for (i = 0; i < Elements(ctx->Color.Blend); i++) { + ctx->Color.Blend[i].SrcRGB = GL_ONE; + ctx->Color.Blend[i].DstRGB = GL_ZERO; + ctx->Color.Blend[i].SrcA = GL_ONE; + ctx->Color.Blend[i].DstA = GL_ZERO; + ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD; + ctx->Color.Blend[i].EquationA = GL_FUNC_ADD; + } + ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 ); + ctx->Color.IndexLogicOpEnabled = GL_FALSE; + ctx->Color.ColorLogicOpEnabled = GL_FALSE; + ctx->Color._LogicOpEnabled = GL_FALSE; + ctx->Color.LogicOp = GL_COPY; + ctx->Color.DitherFlag = GL_TRUE; + + if (ctx->Visual.doubleBufferMode) { + ctx->Color.DrawBuffer[0] = GL_BACK; + } + else { + ctx->Color.DrawBuffer[0] = GL_FRONT; + } + + ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB; + ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB; +} + +/*@}*/ |